US 12,451,560 B2 · Polyolefin separator and method for manufacturing the same

Abstract

A polyolefin separator is provided in the present disclosure. The polyolefin separator includes a polyolefin porous substrate including a plurality of fibrils and pores formed by the fibrils draped across one another. A coating layer surrounding the outer side of the fibrils is contained in the polyolefin porous substrate and the coating layer includes a crosslinked polymer, wherein the polyolefin separator having the coating layer has a change in air permeability of 20% or less and a change in basis weight of 4% or less, as compared to the polyolefin porous substrate. A method for manufacturing the polyolefin separator and a secondary battery including the polyolefin separator are also disclosed.

Claims19

Dependent claims

A polyolefin separator, comprising:

a polyolefin porous substrate comprising a plurality of fibrils and pores formed by the fibrils draped across one another;
and
coating layers surrounding an outer side of the fibrils contained in the polyolefin porous substrate and the coating layers comprising a crosslinked polymer,
wherein the coating layers surround the outside of the fibrils not only on the polyolefin separator surface but also inside the polyolefin separator, and are not separate coating layers differentiated from the porous substrate but are layers formed on the surface of each of the fibrils, and
wherein the polyolefin separator having the coating layers has a change in air permeability of 20% or less and a change in basis weight of 4% or less, as compared to the polyolefin porous substrate.

2 more elements

A method for manufacturing a polyolefin separator, comprising:

preparing a photocurable composition containing a crosslinking agent, a photoinitiator and a solvent;
dipping a polyolefin porous substrate comprising a plurality of fibrils in the photocurable composition and drying the polyolefin porous substrate at room temperature so that the photocurable composition is coated on surfaces of the fibrils of the polyolefin porous substrate;
and
carrying out UV curing on one or both surfaces of the polyolefin porous substrate coated with the photocurable composition to form coating layers,
wherein the polyolefin separator having the coating layers has a change in air permeability of 20% or less and a change in basis weight of 4% or less, as compared to the polyolefin porous substrate.

2 more elements

Dependencies are inferred from the claim text.

Polyolefin separator and method for manufacturing the same

Life of this patent

Polyolefin separator and method for manufacturing the same

Life of this patent

Abstract

Claims19